Alignment sub



FIG. 1 is a front left perspective view of an alignment sub, showing an embodiment of our new design;

FIG. 2 is a rear right perspective view of the alignment sub as shown in FIG. 1;

FIG. 3 is a rear elevated view of the alignment sub as shown in FIG. 1;

FIG. 4 is a front elevated view of the alignment sub as shown in FIG. 1;

FIG. 5 is a bottom plan view of the alignment sub as shown in FIG. 1;

FIG. 6 is a top plan view of the alignment sub as shown in FIG. 1;

FIG. 7 is a left side elevated view of the alignment sub as shown in FIG. 1;

FIG. 8 is a right side elevated view of the alignment sub as shown in FIG. 1;

FIG. 9 is a cross-section view of the alignment sub as shown in FIG. 7 along line 9-9; and,

FIG. 10 is a cross-section view of the alignment sub as shown in FIG. 7 along line 10-10.

The broken lines consisting of dashes show an environment that forms no part of the claimed design. The broken lines consisting of a double-dot/dash pattern show the boundaries of the claimed design and form no part thereof. 

CLAIM We claim the ornamental design of an alignment sub, as shown and described. 